Trailer axle seals short life

[Redland1]

I don’t know if big trailers have the same seals as goosenecks,but I will tell you that if the proper procedure is not followed seals will fail prematurely.Also everything in the assembly needs to be super clean because any debris will shorten the lifespan of the seal as well.Synthethic oil boils at a much higher temp than regular oil and usually extends the life of the seal.